Plant DNA Isolation

I have a couple of questions about preps for isolating plant DNA. First, how
do you get the CTAB and PVPP to dissolve in the CTAB extraction buffer? Or is
it even supposed to??
Secondly, would someone post or send me the recipe for the extraction buffer
used by Dellaporta et al. in their prep in the Maize Handbook. I've used that
in the past and it worked just fine, so I may switch back. Obviously, I don't
have my protocol with me.
Thanks!
Nadine Henderson
Scottish Crop Research Institute
fibnh at scri.sari.ac.uk
(ignore the other address on this posting)